Horn Inspection

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the set plate. (See SET PLATE REMOVAL/INSTALLATION .)
Remove the front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION .)
Remove the horn. (See HORN REMOVAL/INSTALLATION .)
Apply battery positive voltage to horn terminal, and connect the horn retaining bolt to ground as shown in the figure below, and then verify that the horn sounds.

Fig 1: Connecting Battery Terminals To Horn
Courtesy of MAZDA MOTORS CORP.
- If the horn does not sound, replace the horn.